Self-oiling lathe-center.



PATENTED 00T.15, 1907.

E. Km.

SELF 01mm LATHE ummm APPLIUATION FILED MAY 17, 1907.

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@MM WWW? UNITED .STATES PATENT omnes.

ERNST KEIL, OF GRANVILLE, OHIO.

SE L F-OILING IiATHE-CENTER.

lb all 'wil-om 'it moy concern:

lie it known that I, ERNST KEIL, a subject ofthe Emperor of Germany, residing "at Granville, county of Licking, and State of Ohio, have invented certain new and useful Improvements in Self-Oiling Lathe-Centers, of which the'following is a specification.

The invention relates to such improvements and consists of the novel construction and combination of parts hereinafter, described and subsequently claimed.

Reference may be had to the accompanying drawings, and the reference characters marked thereon, which form a part of this specification.

Similar characters refer to similar parts in the several ligures therein.

The single figure of the drawings is acentral, vertical, longitudinal section of my improved self-lubricating lathe-center removed from the lathe, and shown in engagement with the neighboring end of a piece of work to be turned in the lathe.

The principal object ofthe invention is to provide an automatically operating self lubricating center forlathes.

Referring to the drawings wherein the invention is shown in preferred form, 1, represents a hollowbody having a conical end, 2, and adapted for use as the dead-center of a lathe. An axial aperture, 3, forms an outlet leadingr from the axial chamber, 4, which outlet is controlled by a valve, 5, which may be of any known form. I have shown the valve conical in form, and adapted to fit a conical seat surrounding the axial outlet-aperture, 3. A valve-stem, 6, extends outwardly l'rom the smaller end of the conical valve, loosely through the axial outlet-aperture, 3, being of 'a'length adapted to project a short distance beyond the point of the conical end of the center.

The chamber or bore, 4, is cylindrical in form, and Iitting within the same is a piston, 7, `adapted to be forced toward the conical end oftheA center by means of a coil-spring, 8, interposed between the piston and a screw-plug, 9, inserted in the outer end of the chamber. The spring, 8, is adapted to force the piston, 7, approximately to the inner end of the chamber, when the chamber is empty.

vWhen adapted for use', the chamber, 4, contains a body of oil or other lubricating matter interposed between the piston, 7, and valve, 5, which oil is under pressure due to the force of the spring 8.

In using the device, the work, 10, is providedlwith the usual conical centering recess in its end, adapted to receive the conical end, 2, of the center, and is also preferably provided with an extension, 11, of s aid con- Specication of Letters Patent. Appncamnea my 17,1907. serials. 374.125.

' Patented oet. 15,

ical recess, of 'somewhat less depththelength ofV the"valvestem, 6, projecting beyondthe pol'ntofthe I center. l

When the `work is'applied tothe center,`1the'.eng'agement of the valve-stem, 6, with the bottom ofthe recess', 11, will force the valve, 5, inwardly away from its seat, permitting thelubricant to flow from thechamber, 4, out through the outlet-aperture, 3, into the recess, 11, whence it has accessto the engaging surfaces of the work and conical pointof the center, to lubricate the same. The lubricant,'4, being always under pressure, due to the action of the spring, 8, the valve, 5, will automatically close as soon as the work, 1Q, is removed from engagement with the outer end of the valvestem.

The chamber, 4, may be supplied with lubricant in any known manner.

I have shown the body of the center provided with a screw-threaded aperture, 12, through which the lubricant can be inserted, which -aperture is adapted to be tightly closed by a screw, 13.

To facilitate the introduction of the lubricant into the chamber, 4, the outer end of the piston, 7, ispreferably tapped to receive a screw-threaded inner end of a rod, 14, which is adapted to pass loosely through an axial aperture in the screw-plug, 9, and which is provided with a handle, 15,. and with a nut, 16, outside of the screw-plug 9. v

The rod, 14, and nut, 16, are applied only when it is desired to suppl-y the chamber, 4, with lubricant, in which case the` rod is inserted and screwed into the tapped aperture in the piston, and then serves as a means whereby thel piston can be drawn back against the force of the spring, to compress the spring, in which position it can be retained by adjusting the nut, 16, to engage the outer end of the screw-plug 9. The screw, 13,-is then removed, the chamber, 4, supplied with lubricant, and the aperture, 12, again closed by the screw, 13. The rod, 14, is thenunscrewed from the piston, 7, leaving the piston free to respond to the action of the spring, 8, as the lubricant gradually escapes from the'chamber, 4, through the outlet to lubricate the work.Av I

My improved lathe-center can be secured in the tailstock of the lathe in the usual manner.

What vI claim as new and desire to secure by Letters i valve adapted to close said outlet; a work-engaging valve operating stern projecting beyond thepoint of the center: :unl yieldlm.: means for forcing' tbe lubricant toward the outer side of said piston.

vnlve-l0sed Outlet. In testimony whereof, I have hereunto `elet my hand this 1.. lbe combination with a inthe-center body provided 4th day' of May 1907.

with a lubricant chamber, and an outlet leading from said 'lubricant chamber; and a spring engageable with the 1() chamber, through the point of the center; of' a vulve ERNST' KEIL adapted-to close Suid outlet; u work-engaging' valve-oper Witnesses: ating stem projecting through said outlet beyond tbe point C. D, COONS,

of the center; u piston fitting und movable within the WARREN II. ROBERTS. 

